This might be getting old, but it really depends on you. Some complete the architect registration exam in a couple of months (you would need to stop working and there is a great chance you will have a complete meltdown), others take 5 years or more. Whatever you do, do not try to do it as quickly as you can just because of peer pressure. Stop looking at what others have done and study for these exams at your own pace.
The goal is not to memorize all the information just to pass the ARE 5.0 exams, you should actually try to learn new things. Lastly, most of what you learn for the ARE 5.0 exams will be useful throughout your career as a licensed architect.